High Quality Gravity Die Casting Aluminum Die Casting Part

 

Design of gating system for zinc alloy die-casting parts

一、 The influence of pouring system on filling conditions

The filling process of molten metal in die casting is formed by a combination of factors such as pressure, velocity, time, temperature, and exhaust. Therefore, the nozzle system is closely related to pressure transmission, alloy flow rate, filling time, solidification time, mold temperature, and exhaust components.

1) On the one hand, pressure transmission needs to ensure that the metal liquid at the nozzle fills the mold cavity at high pressure and high speed, and on the other hand, it needs to ensure that the metal liquid in the flow channel and nozzle section does not solidify first to ensure the final pressure transmission. This requires optimal flow channel and nozzle design, with minimal pressure loss.

2) If the nozzle area is too large or too small, it will affect the filling process. When the injection conditions are fixed, the filling speed of the nozzle is too large, the metal solidifies too early, or even the filling is insufficient. If the nozzle area is too small, it will exacerbate the injection, increase heat loss, generate eddy currents, and involve too much gas. Reduce the lifespan of the mold.

3) The discharge of gas mainly depends on the flow speed and direction of the metal liquid, as well as whether the overflow system can smoothly discharge the gas, and whether the exhaust area is sufficient. Whether the exhaust is good or not will directly affect the appearance and strength of the casting.

4) The control of mold temperature has a significant impact on the quality of castings, as well as the speed and efficiency of production. The reasonable design of the nozzle can regulate the temperature distribution of the mold.

二、 Selection of pouring system position

1) Reduce twists and turns in the metal liquid filling path, avoid excessive twists and turns, avoid air entrainment, heat dissipation, and pressure loss.

Try to ensure that the distance between the metal liquid and each part is equal, such as opening a central nozzle.

2) Ensure that the temperature distribution meets the process requirements (mold temperature and casting temperature field) and choose the shortest process as much as possible.

3) Try to use a single nozzle as much as possible to avoid collisions between the jets from each nozzle. When multiple nozzles are needed, consider mutual promotion of the jets to avoid air entrainment and energy loss.

4) Try to avoid direct impact on the core or wall, reduce kinetic energy loss, air entrainment, chaotic flow direction, and mold sticking.

5) Reduce the tendency of castings to shrink and deform, allowing easy shrinkage areas to be supplemented and pressurized.

6) Beneficial for exhaust.

7) On surfaces with high requirements and no machining, internal gates should not be installed.

8) It is beneficial for pressure transmission and should be thick before thin.

三、 Exhaust channel and overflow groove

3.1 Exhaust channel

At the final filling area of the metal liquid, it is necessary to set up an exhaust groove;

Its function is to reduce the air pressure at the final filling site, which is beneficial for filling and avoids the generation of pores.

1) The cross-sectional area of the exhaust channel should be 20% to 50% of the internal gate cross-sectional area

2) The thickness of the exhaust channel is 0.05mm

3) The width of the exhaust channel is: 8-25mm

3.2 Function of overflow tank:

① Discharge debris and gas; ② Maintain temperature balance; ③ Improve flow direction (drainage); ④ Work as an ejection platform; ⑤ Accept the first cold liquid metal.

Selection of opening location:

① At the place where the molten metal first flows; ② On the back of the protruding core;

③ At the confluence of multiple streams of liquid; ④ The area where eddy currents occur due to the shape of the casting;

⑤ The last part where the metal liquid flows; ⑥ Dead corners on both sides of the water inlet that cannot be filled with mold;

⑦ An area on a large plane that is prone to shrinkage; ⑧ Generally, areas with lower casting temperatures;

⑨ The area where the material level is thick and prone to shrinkage Difficult to exhaust areas (increase the position of exhaust ducts);

(11) Used as an ejection platform; (12) The area that requires drainage without premature closure of the parting surface.

Size: The total volume accounts for 10% to 30% of the alloy.

Spill area: 60% to 75% of the water inlet area (maximum).

The thickness of the overflow port: 0.25-0.5mm, and the thickness of the overflow port should not be greater than the thickness of the water inlet to ensure the pressurization effect. The overflow groove is connected to the exhaust groove to reduce the cavity pressure and exhaust gas.

 

 

 

 

Basic Information

Total Capitalization	less than US$50,000
Country / Region	China
Year Established	2014
Total Employees	100 to 149
Business Type	Exporter, Manufacturer, Trading Company

 

Trading Capabilities

Total Annual Sales	less than US$50,000
Export Percentage	90 percent to 94 percent
OEM Services	Yes
Small Orders Accepted	Yes
Brand Names	Innolead
Payment Terms	TT
Main Competitive Advantages	Experienced R&D Department, Large Product Line, ODM (Original Designing & Manufacturing), OEM Capability, Production Capacity, Reliability, Reputation
Other Competitive Advantages	NA
Major Customer	Soprano, European Thermodynamics Ltd.
Export Markets	Australasia, Central/South America, Eastern Europe, Mid East/Africa, North America, Western Europe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTACT US

Alex He

Tel:+86 15989331617

Whatsapp&Wechat:+86 15989331617

Skype ID:alex.ho43

Email: alex.he@innolead.net

 

Web:www.innolead.net

 

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